Combustion improving apparatus



Aug- 27, 1946. J. EJPERNE'T 2,406,398-

. COMBUSTION IMPROVING APPARATUS Filed Dec 5. 1941 2 She etS-Sheet 1 Ailg. 27, 1946. PERNET 2,406,398

COMBUSTION IMPROVING APPARATUS Filed Dec 5, 1941 Y 2 Sheets-She et 2 WW I Patented Aug. 27 1946 UNITEDFSTATE COMBUSTION IMPROVING APPARATUS Joseph E. Pernet, Chicago, 111., assignor to Fuel Saver Corporation, Chicago, 111., a corporation of Illinois Application December 5, 1941, Serial No. 421,124 1 Claim. (01.11045) This invention relates to combustion improving apparatus and more particularly t combustion control for use in connection with furnaces, team plants, and the like.

It is an object of the invention to provide an improved combustion apparatus by supplying secondary air over the fuel bed through a tortuous passage in addition to the primary air supplied in the usual manner.

Further objects will be apparent from the specification and appended claim.

In the drawings:

Fig. 1 is a perspective view of a steam plant or furnace, and illustrates one embodiment of the invention.

Fig. 2 is a transverse sectional view through the bridge wall of the embodiment illustrated in Fig. 1 and illustrates the secondary airchannels.

Fig. 3 is a detailed sectional view through the bridge wall and is taken on a line substantially corresponding to line 3-3 of Fig. 2.

Referring to the drawings in detail, the embodiment illustrated comprises a furnace setting I having the usual side and end walls and which, in the present embodiment, is merely illustrative of one type of installation for which the invention is adapted. Th embodiment shown in the drawings comprises the usual fire box 4, grates 5 and ash pit 6, the front of the furnace being provided with the usual fire doors 1 and ash p doors or dampers 8.

It will be understood that in installations of this type any desired draft means may be used, for instance, forced draft may be provided underneath the fire bed. Such draft installations are wellknown, and are, therefore. not shown in the present drawings; however, it is intended that primary air should be delivered in any suitable manner underneath the fire bed and that suitable means be provided for such delivery.

A gas chamber 9 is provided back of a bridge wall Ill and the hot gases and smoke pass over the bridge wall and through this gas chamber and into the smoke flue 3, so that the bridge wall becomes very highly heated.

The bridge wall Ill is preferably made of fire brick and is provided with an elongated medial space H extending substantially from end to end of the wall. Within this space is a series of superposed metal channels !2, alternate channels being longitudinally displaced as shown in Fig. 2, so as to provide an elongated tortuous air conduit between the metal channels and through which an air current may be directed as shown by the arrows. The upper metal channel l2a extends the entire length of the space I l and is provided with openings l3 to enable the passage of air under pressure into a chamber I4 immediately above the metal channels,

The chamber 14 is preferably provided with a metallic header [5 having a substantially vertical side wall I6. This side wall "5 is provided with a large number of very small perforations I! which latter are distributed throughout the length of the bridge wall substantially as shown in Figs. 1 and 2, so that air under pressure maybe forced through these small openings and delivered over the fire bed in a widely distributed spray. Fire brick having correspondingly small holes therethrough'is laid over the front of the header It as illustrated.

A blower I 8 may be driven by means of a motor I9 and this blower communicates with the bridge wall heater space H by means of a suitable conduit 2!! so that when the blower is in operation,

secondary air; under pressure, will be delivered through the small openings l1 and over the fire bed in a direction opposed to the normal direc-- tion of draft in the furnace.

It will be obvious that in normal operation, the bridge wall becomes very hot and the temperature of the air passing therethrough will be raised to approximately 1200 degrees to 1500 degrees Fahrenheit. It will also be understood that the length of the tortuous channel through which the air passes while in the bridge wall may vary in different installations and that any desired number of metal channels may be used to accom..-

plish the desired result.

over the entire extent of the fire bed in the form of a spray and to accomplish this result, a comparatively large number of the small holes I! are provided. The size of these holes is necessarily greatly exaggerated in the drawings. 7 They are preferably only about one-eighth inch in diameter.

While particular embodiments of the invention have been shown, it will be understood, of course, that it is not desired that the invention be limited thereto since modifications maybe made, and it is, therefore, contemplated by the appended claim to cover any such modifications as fall within the true spirit and scope of the invention.

Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:

A bridge wall for use with the fire box of a furnace, said bridge wall having a tortuous passage therein from the bottom of said wall toward the top,'a pressure chamber at the top of said Wall and forming a part of said passage, passages from said chamber into said fire box, and a passage for connection'with means for forcing air through said tortuous passage into said chamher and outsaid openingsand against 'the normal draft in said furnace, said tortuous passage comprising individual superposed channels of uniform cross section longitudinally offset to pro'- 10 vide a zigzag continuous passage from the air inlet to said pressure chamber, each channel comprisinga pair of side flanges and a Web extending between and connecting said flanges, the ends of the webs and side flanges of each channel being a oifset with respect to the ends of the Web and side flanges of an adjacent channel; said Wall having means for closing the projectin ends of, said channels.

JOSEPH E. PERNET. 

